Kinetics of nucleophilic addition reaction of 2- and 4-substituted 9-isothiocyanatoacridines I - VII with glycine in buffered aqueous dimethylformamide has been studied. The addition products, N-(9-acridinylthiocarbamoyl)glycines VIII - XIV, were characterized by IR, UV, 1H NMR, mass and fluorescence spectra. Derivatives VIII, X and XII exhibited higher fluorescence intensity than the starting isothiocyanates; the highest fluorescence was found for the unsubstituted compound X. The reaction mechanism is discussed on the basis of properties of the reaction products and kinetic characteristics.
研究了2-和4-取代的9-异
硫氰酸基
吖啶-在缓冲
水合二甲基甲酰胺中与甘
氨酸的亲核加成反应动力学。加成产物
VIII-
XIV为
N-(9-
吖啶基
硫氨酰)甘
氨酸,通过红外、紫外、
1H核磁共振、质谱和荧光光谱进行表征。衍
生物VIII、
X和
XII的荧光强度高于起始异
硫氰酸酯,其中无取代化合物
X的荧光最强。根据反应产物的性质和动力学特征讨论了反应机理。